基于拉锥细芯光纤的大量程双参量传感器
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湖北师范大学

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A Large Range Double Parameter Sensor Based on Tapered Thin Core Fiber
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1.Hubei Normal University;2.湖北师范大学

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    摘要:

    摘要:折射率与轴向应变的监测是工程应用的重要组成部分。为了实现大量程的折射率、应变双参量测量传感器,提出了一种基于锥形细芯光纤传感器。首先在两段标准单模光纤之间熔接一段长度为2 cm的细芯光纤,然后在细芯光纤中心放电并拉锥,制作得到一个全光纤马赫-曾德尔干涉仪。在实验中,利用丙三醇溶液替代氯化钠溶液可扩大折射率的测量范围。实验结果表明,在1.3511-1.3803范围内,折射率的最高灵敏度为-20.95 nm/RIU;在1.3843-1.4466范围内,折射率的最高灵敏度可达-294.32 nm/RIU。在0-2727 με的应力范围内,表现出-0.6 pm/με的应变灵敏度,这说明该结构在折射率量程大且灵敏度高的前提下,也维持着较强的鲁棒性。该器件制备简单、结构紧凑,在折射率和应力测量等领域具有一定的应用价值。

    Abstract:

    Abstract: Monitoring refractive index and axial strain is crucial in engineering applications. To achieve a large-range sensor for the measurement of these dual parameters, we propose a fiber optic sensor based on a tapered thin-core fiber. A compact all-fiber Mach-Zehnder interferometer is fabricated by fusing a 2 cm length of thin-core fiber between two standard single-mode fibers and tapering it in the center. In our experiment, we extended the measurement range of the refractive index by using propylene glycol solution instead of sodium chloride solution. Our results show that the highest sensitivity of the refractive index is -20.95 nm/RIU in the range of 1.3511-1.3803 and can reach -294.32 nm/RIU in the range of 1.3843-1.4466. In the strain range of 0-2727 με, it exhibits a sensitivity of -0.6 pm/με, indicating that the structure maintains strong robustness even with a large refractive index range and high sensitivity. The device is simple to manufacture, compact, and has applications in refractive index and strain measurement.

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  • 收稿日期:2023-02-10
  • 最后修改日期:2023-04-28
  • 录用日期:2023-05-10
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